Throttle-valve.



PATENTED APR. 23, 1907.

F. E. NORTON. THROTTLE VALVE. APPLIOATION FILED D3014, 1905.

2 SHEETS-SHEET 1.

i'iiiiiiiiiiiiiiiiiiiiT I N 0 T R O N R v THROTTLE VALVE. APPLICATION FILED DEO.14, 1906.

2 SHEETS-SHEET 2.

tumm

50 said valve FREDELMER NORTON, OF YOUNGSTOWN, OHIO.

THROTTLE-VALVE.

Specification of Letters Patent.-

.catented April 23, 1907.

Application filed December 14, 1906. Serial No. 347.891.

and advantages of which will-be hereinafter set forth, reference being had to the annexed drawings, wherein:

Figure 1 is a longitudinal sectional view of one form of my improved valve; Fig. 2, a

i 5 sectional elevation, on an enlarged scale, of

the main valve; Fig. 3, a similar view of the pilot valve and the valve stem; Fig. 4, a'lon gitudinal sectional view of a modified form of valve embodying my invention. Fig. 5; an

enlarged sectional view of the main valve;

Fig. 6, a sectional elevation of the valve; view on the line 77 ofFig. 4.

The main object of the invention is to propilot vide a balanced throttle valve, which may be easily and safely opened and in which all hammering is done away with and the danger accompanying the same avoided.

The invention may be said to comprise a 1,0 main valve, apilot valve, which initially controls the admission of fluid under pressure from one side of the valve to the other,

and a positive but shifting connection, such as a screw-threaded connection, between thepilot valve and the main valve, whereby movement of the main valve from and toward its seat independent of the pilot valve is prevented and hammering pre eluded.

In the annexed drawings two embodiments of the invention are illustrated.

Referring first to that illustrated in Figs. 1 to 3 inclusive, A denotes the valve body, B the bonnet provided with the usual packing 5 gland O and yoke D, which latter carries a nut E through which passes the threaded portion of the valve stem 'F, the lower endof said stem passing into a guide G. H denotes the main valve seat, and I the main valve, being provided with an upwardly externally threaded head or proextending, och f t} jection J, the direction and threads being the same as the ireaded porand Fig. 7, a horizontal sectional.

tion of stem F. Valve I is provided with ports K and L, the latter being formed around the base of the head J and the seat M for the pilot valve upon the upper face of the main valve adjacent to the head. The pilot valve comprises a cup-shaped or cylindrical member N, internally threaded and adapted to make a neat fit with the head J. Said valve is pinned to the valve stem F and at all times rotates therewith. The valve stem F passes freely through the main valve 1, and a washer O, which is held in place by a nut P, is mounted upon the stem beneath said valve. Pressure upon the valve is in the direction of the arrow in Fig. 1, and the operation of the structure is as follows: Assuming that the parts, are in the position shown in Fig. 1, the operator turns the hand-wheel Q and thereby rotates the valve stem, causing it to travel upwardly through nut E and at the same time to rotate the'pilot valve N, causing it to move off of its seat M. This will open ports K and L and allow the fluid under pressure to pass through the main valve and consequently equalize or balance the pressure upon 0 posite sides of said valve. The main va ve is, however, precluded from chattering or hammering on its seat by reason ofthe positiveconnection maintained b the screw-threaded head and the pilot va ve. Further rotation of the stem will cause the washer O to come into contact with the under face of the main valve, and. upon continuing such rotation the main valve may be readily lifted from its seat 11 and full passage through the valve afforded,

In Fi s. 4 to'7 inclusive a modified arrangement 0 the-"invention is illustrated. The valve body a is surmounted by a bonnet 6, having the usual packing gland 0, through which the valve stem (1 asses. The yoke or frame 43 carries a nut 3? through which the threaded portion of t e stem passes. Rotary motion is imparted to the valve stem through a rotatable sleeve g mounted in the yoke and splined to the stem, suitable gear' ing being employed to actuate the sleeve.

The main valve seat is denoted by h, and the main valve i is provided with-a piston-head which works within the cylindrical chamber is, which is'ported at l. The upper central portion of the main valve'i' is provided with a I valve into the central aperture defined by said valve seat m. The main valve is also provided upon its upper side with a centrally V disposed head piece or projection 0, which is internally threaded, said head. being preferably supported by ribs p extending inwardly from the body of the valve.- A collar q is secured to the upper face of the head, the wall of the centrally disposed opem'n in said collar making a relatively close t with the valve stem (1. Upon the lower end of the valve stem (1 there is mounted an externally threaded pilot valve rywhich is held on the stem by a bushing or collar 8 and locked to the stem by a cross-pin or key t, so as to rotate with said. stem. The pitch and direction of the threads upon the pilot valve are the same as on the stem.

The operation ofthis form of the device is as follows: In Fig 4 the main valve and-the pilot valve are shown as seated Upon rotation of the sleeve 9 and conseouent rotation and elevation of the stem (Z the pilot valve will also be rotated and elevated and at the same time will screw threaded head 0. The fluid under pressure will then pass from the cylindrical chamber it, around the pilot valve and" through the ports or openings n, into chamber a, as indicated by the arrows in Fig. 4. The passage afforded through the ports n'and around the ilot valve when the same is elevated is arger than that through the port Z, whereby the diflerent pressures existing in the chamber 7c and in the chamber a are equalized when the pilot valve is widely opened. The main valve 2' may then be readily opened, themember 8 coming into contact with the under face of the collar 9, and the valves moving as one with the stem d until a full port or passage is afforded through the valve.

Both forms of' the invention secure the proper action of the pilot valve in a sin'i le manner and avoid the well known diflicu ty present in valves of this kind where the pilot valve is free to slide longitudinally within the main valve, thereby permitting the main valve to move longitudinally independent of the pilot valve to an extent equal to the amount of lift 'given'te the pilot valve, with the result that when the main valve is partly opened it is lia'ble to pound or hammer on its seat when the pressure in the outtake side of the valve is fluctuating. I p

. In the valve herein described the pilot valve-may be given as great a lift as desired,

the threaded connection-between said valve and the'main valve preventing any harmful longitudinal movement relatively to the operating stem.

In practice it has been found that the coninto the internallystruction herein shown may be successfully used where, without the threaded engage ments, the valves would immediately destroy themselves. 7

Having thus described my invention what I claim is:

p 1. In combination with a main valve, a pilot valve for controlling the passage of fluid under pressure from one side to the other of the main valve ,umeans securing a positive engagement between said pilot valve and the main valve at all times and permitting the pilot valve to be moved from'its'seatindependently of any movement of the main valve without becoming disengaged from the main valve; and means for raising the main valve from its seat upon a continued movement of the pilot valve.

2. In combination with a main throttle valve and valve seat, a pilot valve and valve seat; a threaded connection. between said pilot valve and the main valve; means for rofrom its seat; andmeans actin upon a continued rotation of the pilot-valve to lift the main valve from its seat. p I

' 3. In athrottle valve, thecombination of a main valve provided with a threaded 'projection;'a threaded pilot valve engaging said threaded projection and controlling ports or passages formed in the main valve,- a stem connected to said pilot valve and rotatable therewith; and means for arresting the initial inde endent movement of the pilot valveafter t e same is moved ofl of its seat, whereby upon a continued rotation of the stem the main valve will be withdrawn from its seat.

been lifted from its seat and to lock the main valve to the stem, whereby upon a continued rotation of the stem the main valve will be lifted-from its seat.

5. In a throttle valve, the combination of a main valve provided with ports or passages extending through the same; a threaded r0- jection extending upwardly from said va ve;

a threaded pilot valve engaging said threaded projection and serving to close the ports or passages through the main valve; a rotary valve stem; a connection between said stem and pilot valve to cause the same to turn in unison; and a lost motion connection 'be- A tween the stem and the main valve whereby tating. the pilot valve and lifting the same ,4, In a throttle valve, the combination of rotary motion of the pilot valve when it has I carried by the stem for engaging the main IO valve. w I

In"testin1ony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDELMER NORTON.

when the pilot valve is fully opened the connection between the stem and the main valve will be established and the mainvalve opened upon a continued rotation of the stem.

6. In a throttle valve, the combination of a main valve; a pilot valve engaging the main valve by a threaded connection; a threaded Witnesses: stem rigidly affixed to the pilot valve, the W. S. DOUGLAS, pitch of the threads being similar; and means N. O. HURST. 

